Development of phenomena identification and ranking tables (PIRTs) to implement research reactor-specific capability in SPACE code.

• A PIRT process is performed for an open-tank-in-pool research reactor. • The process includes the most commonly postulated events of research reactors. • The process is intended to extend the SPACE applicability to the research reactors. • A preliminary data set for V&V are proposed for code assessment. • Proposal on further research is given to increase knowledge levels of the RRs. The benefits of research reactor technology are always essentially accompanied by nuclear safety, which is ensured by a series of supporting analysis such as safety analysis. In order to extend the applicability of the Safety and Performance Analyzing Code (SPACE code) to safety analysis of typical open-tank-in-pool type research reactors using plate-type fuels, a Phenomena Identification and Ranking process was performed for most of the relevant internal event scenarios of a reference research reactor, i.e., the KiJang Research Reactor, designed and under development by the Korea Atomic Energy Research Institute (KAERI). The Structures, Systems, and Components (SSCs) important to nuclear safety of the reactor were included in the PIR processes. A summary of important results from the PIRT study on the research reactors is presented with a proposal on a preliminary set of data bases for a validation and verification matrix in addition to research issues. [ABSTRACT FROM AUTHOR]